Tehran University of Medical SciencesIranian Journal of Allergy, Asthma and Immunology1735-150217420180812Quantum Dot-labeled Tags Improve Minimal Detection Limit of CA125 in Ovarian Cancer Cells and Tissues326335ENSorourShojaeianDepartment of Biochemistry, Medical Genetics, Nutrition, Alborz University of Medical Sciences, Karaj, IranAbdolamirAllamehDepartment of Clinical Biochemistry, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, IranMahmoodJeddi-TehraniDepartment of Hybridoma, Monoclonal Antibody Research Center, Avicenna Research Institute, Academic Center for Education, Culture and Research (ACECR), Tehran, IranRoyaGhodsOncopathology Research Center, Iran University of Medical Sciences, Tehran, Iran AND Department of Molecular Medicine, Faculty of Advanced Technologies in Medicine, Iran University of Medicine Sciences, Tehran, IranJalehShojaeianUniversity of Maryland School of Pharmacy, Baltimore, Maryland, USAAkram-SadatTabatabaei-PanahDepartment of Biology, Faculty of Basic Sciences, Islamic Azad University, East Tehran Branch (Ghiamdasht), Tehran, IranAmir-HassanZarnaniDepartment of Immunology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran AND Reproductive Immunology Research Center, Avicenna Research Institute, ACECR, Tehran, Iran AND Immunology Research Center (IRC), Iran University of Medical Sciences, Tehran, Iran2017080120180213In recent years, a lot of attention has been paid to quantum dot (QD) nanoparticles as fluorescent sensors for sensitive and accurate detection of cancer biomarkers. Here, using a homemade specific monoclonal antibody against CA125 and QD525- or FITC-labeled probes, expression of this marker in an ovarian cancer cell line and cancer tissues were traced and optical properties of fluorophores were compared qualitatively and quantitatively. Our results clearly showed that besides lower background and exceptionally higher photobleaching resistance, QD525 exhibited higher fluorescent intensity for both ovarian cancer cell and tissues at different exposure times (p<0.0001) and excitation filter sets (p<0.0001) exemplified by significantly higher staining index (p<0.016). More importantly, the FITC-labeled probe detected antigen-antibody complex at minimum concentration of 0.3 mg/mL of anti-CA125, while reactivity limit decreased to 0.078 mg/mL of anti-CA125 when QD525-labeled probe was applied showing four times higher reactivity level of QD525 probe compared to the same probe labeled with FITC. Based on our results, it seems that QDs are inimitable tags for sensitive detection and localization of ovarian cancer micrometastasis and molecular demarcation of cancer tissues in surgical practice, which subsequently figure out accurate therapeutic approaches. http://ijaai.tums.ac.ir/index.php/ijaai/article/view/1603http://ijaai.tums.ac.ir/index.php/ijaai/article/download/1603/840